MAHLE S42221.020 PISTON RING SET (.020) FOR 89-02 CUMMINS 5.9

Product Description

Restore compression, tame blow-by, and control oil with the MAHLE S42221.020 piston ring set for the 1989–2002 5.9L Cummins (12-valve & 24-valve). This +.020" (≈4.036") oversize single-cylinder ring pack is engineered to OE geometry for fast seat-in and long service life in hard-working tow rigs and daily drivers.

Mahle S42221.020 piston rings, Cummins 5.9L +.020 rings, Ram 2500 Ram 3500 1989–2002 ring pack, Mahle Clevite S42221 020 overbore, 6BT ISB diesel ring set, fast seating, low oil consumption, CPP Diesel Mahle rings, 4.036 bore .020 over, chrome-faced top ring, work truck rebuild

Fitment

• 1989–1998 Dodge Ram 2500/3500 – 5.9L Cummins 12-valve (6BT), finished bore +.020"
• 1998.5–2002 Dodge Ram 2500/3500 – 5.9L Cummins 24-valve (ISB), finished bore +.020"

Cross-Reference / Alternatives (Mahle on CPP Diesel only)

• MAHLE S42221 (STD) – 89–02 Cummins 5.9
• MAHLE S42170.020 (.020) – 89–07 Cummins 5.9
• MAHLE S42170 (STD) – 89–07 Cummins 5.9
• MAHLE S42170.040 (.040) – 89–07 Cummins 5.9

Notes

Sold per cylinder. Order six (6) sets for a complete engine. Measure finished bore, confirm piston/ring compatibility, verify hone finish (RA), and file-fit ring end gaps to spec.

FAQ

Will this fit both 12V and 24V 5.9L Cummins?

Yes—S42221.020 covers 1989–1998 12-valve and 1998.5–2002 24-valve engines when bored/honed +.020".

Is this a full engine set?

No. This is a single-cylinder ring pack. Order six to service a complete 5.9L.

What materials are used?

Typical S42221 family construction: ductile-iron, chrome-faced top ring; cast-iron second; 3-piece oil control assembly.

Specifications for Mahle S42221.020